LAPOP holds its surveys and studies to the highest standards of quality. Questionnaires are systematically pre-tested in-country; hand-held electronic systems (PDAs) are widely used to eliminate data collection and processing errors and to easily enable experimental treatments; sophisticated probability samples are designed and employed to ensure representative samples at the national and subnational levels; and, cutting-edge statistical methods are used in data analysis.
Through years of polling an expanding set of countries using sophisticated techniques, LAPOP has developed a treasure trove of high quality data on political views within the Americas. The data are used by academic researchers; the United States Agency for International Development (USAID) in its efforts to promote democracy and good governance in Latin America and the Caribbean; the World Bank in its Governance Indicators series; the Inter-American Development Bank in its numerous research projects; the United Nations Development Programme and the Organization of American States in their democracy programs; and perhaps most significantly, by the governments of several Latin American countries as a source of independent information with which to assess public opinion and shape policy.
Each survey is implemented based on a national probability design. In some cases oversamples are collected to allow precise analysis of opinion within sub-national regions. Survey participants are voting-age adults interviewed face to face in their households, except in Canada and the United States where the interviews are Web-based.
AmericasBarometer uses this weighting scheme
(en Español) for each year of surveys.
Please note: 2012 AmericasBarometer Sample Design and Design Effects (en Español), and the 2010 AmericasBarometer Sample Design and Design Effects